The traditional principles of mass production are being challenged by concepts of highly customized and personalized goods. A growing number of do-it-yourself (DIY) inventors, designers, makers, and entrepreneurs is accelerating this trend. This class offers students hands-on experiences of DIY product design and fabrication processes. Over the course of a semester, students work individually or in small groups to design a customized and personalized product of their own and build it using various DIY fabrication methods, including 3D laser scanning, 3D printing, laser cutting, vacuum forming, etc. Students develop multiple prototypes throughout the semester, iterating and refining their design.